This question solely depends on how your organization chooses to implement change management procedures and processes. Myself i've seen both approaches that you have mentioned in your question and works well for each of the organizations as they had implemented. Is there a straight answer coming from anything i've read within V2, no. is there something in V3, i can't say.

Far as your question in regards to linking CR's, my question would be why are you linking them? Are you linking them as apart of a release, are you linking them because Change A caused Change B, are you linking them because Change A is dependent on Change B? As you answer these types of questions that will tell you when you would link them._________________Adam
Practitioner - Release and Control
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"Not every change is an improvement, but every improvement requires a change"